docs: async def delete(self):
          """
          Delete the TURN allocation.
          """
          if self.refresh_handle:
              self.refresh_handle.cancel()
              self.refresh_handle = None
  
          request = stun.Message(message_method=stun.Method.REFRESH,
                                 message_class=stun.Class.REQUEST)
          request.attributes['LIFETIME'] = 0
          await self.request(request)
  
          logger.info('TURN allocation deleted %s', self.relayed_address)
          if self.receiver:
              self.receiver.connection_lost(None)